My cardio just put me on Toprol 25 mg 1/day. I used to take it before my first OHS, I think b/c of palpitations and/or my cardio at the time was trying to slow down my valve damage? :confused2: Anyhow, I believe it was after my second surgery (replacement) he took me off of it b/c I complained of tiredness, also my heart rate was pretty low, so remember that being an issue. That was over three years ago, was diagnosed with a-fib last year, started having issues recently, wore a heart monitor for two weeks which recorded 130-150 resting hr at times.... so now the Toprol again. I am worried about it making me tired, I have so much going on right now and I get tired easily enough without it! It doesn't seem that there are other options as far as beta blockers go that don't cause drowsiness. Any feedback is appreciated - thanks.